Water-tube boiler.



No. 761,829. PATBNTED JUNE 7, 1904. E. T.A HANNAM. l

WATER lTUBE BO'ILBR.

APPLICATION YILED HOV.`27`. 1903.

m o X Q Q n 7 i` l QJ N im b Uy la, h o QB. 1 b f 7 m #1 5* s# *Ef w' l"8% Q Wnses 1 l y Invh/o'r- HoTaLITHu., WASHINGTON, u, z:`

No. 761,829. PATENTED JUNE f7, 1904. Y E. T. HANNAM.

WATER TUBE BOILER.

APPLIOATION FILED Nov. 27. 190s. No MODEL, 2 SHEETS-SHEET z.

/II ,mi l

I l l 50099609099900616900 @GEOG .OGOOOOGOOOOO .OGOOOOOOOGOO.IGOOOGOOOGOGO @@OOOOGOQOOOQOOOOGO :OOOOOGOOO-OO-O @www-mow@ vl?lW'nesoe@ Inman/or NAM, a citizen of the United States, residing toprovide a steam drum or drums above and of Ohio, have invented certainnew and useful 'together than would be required were the delivery fromthe water -legs freevand4 open i UNITED STATES Patented June 7, 1904.

PATENT OEEICE.

WATER-TUBE BOILER.

SPECIFICATION forming part of LettersV Patent N0. 761,829, dated June 7,1904.

Application iiled November 27, 190,3.

'o, @ZL wle/om t may concern,.-

Be it known that I, EDWARD THOMAS HAN- at Cincinnati, county ofHamilton, and State Improvements in Water Tube Boilers, of which thefollowing is a full, clear, and exact description, reference being hadto the`accompanying drawings, forming part of this speciiication.

It is usual in water-tube-boiler construction parallel to the series ofWater-tu bes and to rivet the water-legs at front andreartothesteam-drum. This riveting necessarily has to be done by hand orby hand-machine, amatter of considerable expense in construction, and inaddition material is wasted in cutting the water-leg plates to fit, andthe plates have to be heated and shaped in various ways to conform tothe surface of the drum. In older constructions the water-leg throatsare necessarily constricted, which tends to impede the circulation,which necessitates as much depth as possible of each water-leg, andconsequently longer stay-bolts to hold the water-leg plates throughout.In addition to this in Yexpanding the water-tubes into the Water-legs alonger mandrel has to be employed, and the expense and difficulty ofoperation is necessarily increased where-there is considerable spacebetween the front and the rear plate of the waterleg. In such olderconstructions the boiler cannot be shipped'in sections, and greatexpense is frequently incurred in installing such boilers by reason oftheir cumbersome dimensions. I/Vhere ordinary steam-drums are employedin connection with the Watertubes and in order to furnish superheatedsteam, superheating appliances have to be added at considerableadditional expense, as the steamdrums alone obviously cannot be used forsuperheating purposes.

My invention is directed toward overcoming these difficulties; and itsobject is to provide a safe, durable, and economical watertube boilerwhich may be shipped in sections when required, which can be riveted byma- Serial No. 182,861. (No model.)

chine without hand-driven rivets, in which no Hanging or iitting of thewater-legs to the steam-drum is required and no waste of materialincurred, in which there are no seams exposed to the fire or hot gases,in which superheated steam isalways furnished without additionalsuperheating appliances, and which in many other ways to be hereinafterreferred to is very economical in construction, occupies less space withthe same length of tube-surface, and which can be used for marineconstruction as well as on land.

In the drawings, Figure l is a sectional side elevation of my improvedwater-tube-boiler construction. Fig. 2 is a cross-sectional elevation ofsame. Fig. 3 is a vertical section of a modified construction ofwater-leg and drum. Fig. 4 isy a plan view of a portion of the water-legdrum, showing method of bracing the throat of the water-leg.

The boiler is provided with the usual heating appliances, in which A isthe base, and B is the-front wall; C, the rear wall; D, the gratebars;E, the ash-pit; F, the bridge wall, and Gr the combustion-chamber.

H represents the series of water-tubes running lengthwise of the furnacearranged in the usual staggered series and provided with the front andrear water-legs L M, into which the Water-tubes are expanded lin theusual way. The outer plates of the water-legs are provided with theusual hand-holes for access to the water-tubes, the hand-holes beingclosed by hand-hole plates with gaskets and the usual crabs and bolts aa.

N P are water-leg steam-drums, which are a part ofthe water-legconstruction andwhich run parallel to and opening into the leg portionthroughout its entire width.

In the usual construction of water-tube boilers it is customary, asheretofore noted, to provide one or more steam drums parallel with thewater-tubes and to which the front and rear water-legs are riveted, withnecessarily narrow and constricted openings from the water-legs into thesteam-drums. My construction is a complete departure from this olderarrangement. My stearndrums are a part of the water-legs and can becalled very properly water-leg drums. These steam- IOO drums andwater-leg portions are preferably made ot' suitable wrought-steelplates-a vfront plate, and a rear plate. rIhe upper portions of theseplates I) c are rolled in a cylindrical shape, the lower portions (l ebeing flat and in which flat portions are punched the holes for thewater-tubes and the hand-hole openings, and the two plates making up thesteamdrum and water-leg are then riveted together at the top at f and atthe bottom at g. Instead of this construction the water-leg drum can berolled in a single cylinder and the water-leg riveted thereto, as shownin Fig'. 3. In either ease, however, it is necessary to properlyT bracethe construction at the opening between the water-leg and the drum. Inorder not to obstruct this passage-way, I provide the necessary numberof brace-plates fm m of suiicient width and thickness and twist thesebrace or stay plates, so that the iiat ends Z Z may be riveted to thedrum on each side and the twisted edge of the plates will extend acrossthe opening. In this way without obstructing the opening I obtain amplestrength and rigidity of construction. rIhc heads for the drums andwaterlegs are then riveted in place, and the water-leg and drumconstruction is complete.

It will be noticed that the water-leg being a part of the drumconstruction there is no waste of material nor shaping and titting ofthe water-leg' to the steam-drum, and, moreover, that there is no seamin any way exposed to the hot gases. Inasmuch as the water-legs openthroughout their entire length into the drums, these openings are in noway constricted, so that I am able to provide less depth Jfor thewater-legs, and therefore shorter stay-bolts can be used, giving greaterrigidity and durability at less expense.

The rear water-leg drum can be of considerably larger diameter than the.front drum, as it is into this drum that the feed-water is delivered.In this drum I arrange a mud-pan or puriiier, and it is evident th at amuch larger purifier can be employed than in the ordinary constructions,as the mud -pan can extend nearly the entire length of the drum.I

To provide for the water circulation between the drums II I), I arrangein the length of the drums a series of equalizer-pipes S, the lower setbelow and the upper set above the usual water-line of the drums, and, asusual, to insure proper circulation, the water-tubes H ot' the boilerare inclined to the rear. Located intermediate the end drums, parallelthereto and somewhat higher, is a steam-d rum T with the steam-outlet U,and the drum is connected with each water-leg drum above the waterlineby the tubes V, which can be otl a number of rows to get a greatersuperheat in the steam. Above the steam-tubes V the tile-roeic W ot' theboiler is constructed. Flue-partitions can be arranged to direct thecourse of the lire and hot gases in any desired way; but I prefer toprovide two horizontal partitions Y Y, one at the bottoni and one at thetop ol' the water-tubes H, so as to direct the course o t the lire fromthe combustion-chalnber at the rear to the liront water-leg at the top,so as to obtain the tull eliect ot the lire throughout the length of thewater-tubes. The course of the lire and hot gases is then around theequalizer-tubes S and the steam-tubes V and out through the smoke-outletZ. Itis evident that the equalizer-tubes will furnish a much moreeconomical exposed surface to the lire than the usual steam drum ordrums and that the steam-tubes V V will become superheatertubes, so thatonly superheated steam will be carried to the steam-drum T, which drumalso has considerable heating-surface.

By means ot' the construction in which the water-drums are locatedacross the ends ot the boiler-tubes at right angles thereto with thesteam-drum above the plane ot the water-leg drums it is evident that myconstruction ol boiler can be used in marine propulsion, as the rollingand tossing of the vessel will not be suilicient to throw any water intothe intermediate steam-drum, which can be placed, as will be readilyunderstood, at any desired height. As will be seen, practically all olthe heating-surface of the boiler is a tubular su r- `face, so thatcirculation is positive, steam conversion very eifective, and all withgreat economy in construction. The boiler can either be shipped as awhole or in sections, as may be required. The front water-leg with itsdrum, the rear water-leg with its drum, the superheatcr steam-druln, thewater-tubes, equalizer-tubes, and superheater-tubes may all betransported separately and the tubes expanded into the water-legs anddrums at the place of installation. The brickworhY ol the boiler is alsoless than is ordinarily required, as the water-legs and drums malte upthe entire front and rear walls at and above the boiler.

It will be of course understood without detailed description that theusual boiler accessories are provided, such as safety valve, steam-gage,water-level gage, blow-oil pipes, and feed-inlet pipe, damper, &c.

In connection with the damper I might add that with my construction thedamper-traino and damper can be placed lower than in the longitudinalsteam-drum constructions, for the reason that I can omit certain ot thetubes V running to the rear drum, and thus leave a space in which toswing the damper in the, smoke-inlet with the damper-frame considerablylower than in most older constructions.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, isu

l. Ina water-tube boiler, a series ot watertubcs, water-leg therefor,and unter-leg drum, with passage between the leg and drum, andstay-plates secured across the passage-way,

IOO

IOS

llO

the stay-plates being bent to present their edges across the opening.

2. In a water-tube boiler, a series of watertubes, and water-legstherefor, with water-leg drums running parallel to the water-legs, andstay-plates riveted to the drum across the opening between drum andwater-leg, the stayplates being bent to present their edges across theopening.

3. In a water-tube boiler, the combination with a series of water-tubes,of water-legs and water-leg drums therefor, equalizer-tubes between thewater-leg drums, and an intermediate steam-drum-with steam-tubesconnecting the intermediate drum with the water-leg drums.

4. In a water-tube boiler, the combination with a series of water-tubes,of water-legs and water-leg drums therefor, equalizer-tubes between thewater-leg drums, an intermediate drum located above the plane of thewater-leg drums, with tubesconnecting the intermediate drum with thewater-leg drums above the water-line.

5. In a water-tube boiler, a water-leg with a water-leg drum formed in apiece with the water-leg plates, with seams at the top of the drum andbottom of the water-leg, whereby no seam will be exposed to the hotgases.

6. In a water-tube boiler, the combination with a series of water-tubes,water-legs at front and rear into which the water-tubes are eX- panded,drums at right angles to the watertubes, into which the water-legs openthroughout their length, and to which the water-legs are riveted,equalizer-tubes connecting said drums, and an intermediatecentrally-located drum, parallel to and in a plane above said water-legdrums, with tubes connecting the central drum with the water-leg drums.

' E. THOMAS HANNAM.

Witnesses:

W. S. KYLE, C. W. HOFFMAN.

